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    Re: Was Bowditch Table 15, now confused
    From: Bill Noyce
    Date: 2005 Jan 26, 17:24 -0500

    Perhaps a clearer way to put it is that the Sensible Horizon
    is perpendicular to the vertical.  As it happens, measurements
    using a pool of oil or mercury are relative to the Sensible
    Horizon.
    
    
    

       
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